A method for preventing radio frequency link failures in a radio telecommunication network. The method is adapted to find the driving strength of an output pin of a target cell. One surface of the web consists of a planar non-woven fabric layer and is connected with non-woven fabric that is disposed on the opposite surface of the web in areas between the film strips. The carrier has a bottom edge arranged at a distance above the tub edge which, together with the tub edge, form a groove that is open towards the interior of the tub body. Pressing the clinching punch, in a direction opposite to the punch pressing, into the other portion of the second layer surface forces portion of the second layer into the aperture, and forms a micro-interlocking flush-back joint between an aperture side wall and the second layer portion.